Access important SEO metrics while you surf the web. This toolbar from Moz lets you see metrics like Domain Authority and Page Authority for every page you visit, analyze links as you browse, expose page elements, and access other SEO tools.

Counting the number of words, characters without any extra clicks. Just select the text and the statistics appears in the top right of the toolbar. It gives detail report about the numbers of sentences, paragraphs, average lengths, keyword density...

Create a QR Code of the selected text or current URL. Customize image with different colors and sizes.Use CTRL-SHIFT-Q to quickly see the QR Code. Also possible to create a QR Code from free text within Firefox. Works completely offline!

This add-on tweaks the default add-on bar and makes it look much cleaner and more convenient, simply hover over the add-on bar area at the bottom right side of the browser window and you'll see your icons all neatly organized, it has transitions.